Enum Expression

pub enum Expression<'a> {
    ConditionTree(ConditionTree<'a>),
    Compare(Compare<'a>),
    Value(Box<DatabaseValue<'a>>),
}

A database expression.

Variants

ConditionTree(ConditionTree<'a>)

A tree of expressions to evaluate from the deepest value to up

Compare(Compare<'a>)

A comparison expression

Value(Box<DatabaseValue<'a>>)

A single value, column, row or a nested select

Trait Implementations

impl<'a> Clone for Expression<'a>

fn clone(&self) -> Expression<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Expression<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> From<Compare<'a>> for Expression<'a>

fn from(cmp: Compare<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<ConditionTree<'a>> for Expression<'a>

fn from(ct: ConditionTree<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Select<'a>> for Expression<'a>

fn from(sel: Select<'a>) -> Expression<'a>

Converts to this type from the input type.

impl<'a> PartialEq for Expression<'a>

fn eq(&self, other: &Expression<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> StructuralPartialEq for Expression<'a>